Just like Parallels Virtuozzo?
That required licenses for each containerised application, can't see why this would be different.
Main limit on Parallels was that if you wanted to install some software in a container that required Kernel or zone 0 access then it simply wouldn't work, everything was required to be in user space, for example you never used to be able to install Citrix in a container (haven't tried XA7 with VDA).
We had to leave that because of too many cases where some software wouldn't work because of some driver or other and they had to control which Windows Updates you could deploy.
MS running this I think is a great step forwards since at least Windows Updates will be designed to cater for this situation, though at this stage I don't think it supports any real server operations beyond simple .net / web. IMO should have just bought Parallels and made it more compliant.
Guess Solaris zones is similar but things are designed to be run in user space anyway